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1 # gcc-plugin.m4 -*- Autoconf -*-
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2 # Check whether GCC is able to be built with plugin support.
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3
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4 dnl Copyright (C) 2014 Free Software Foundation, Inc.
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5 dnl This file is free software, distributed under the terms of the GNU
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6 dnl General Public License. As a special exception to the GNU General
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7 dnl Public License, this file may be distributed as part of a program
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8 dnl that contains a configuration script generated by Autoconf, under
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9 dnl the same distribution terms as the rest of that program.
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10
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11 # Check for plugin support.
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12 # Respects --enable-plugin.
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13 # Sets the shell variables enable_plugin and pluginlibs.
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14 AC_DEFUN([GCC_ENABLE_PLUGINS],
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15 [# Check for plugin support
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16 AC_ARG_ENABLE(plugin,
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17 [AS_HELP_STRING([--enable-plugin], [enable plugin support])],
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18 enable_plugin=$enableval,
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19 enable_plugin=yes; default_plugin=yes)
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20
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21 pluginlibs=
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22
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23 case "${host}" in
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24 *-*-darwin*)
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25 if test x$build = x$host; then
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26 export_sym_check="nm${exeext} -g"
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27 elif test x$host = x$target; then
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28 export_sym_check="$gcc_cv_nm -g"
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29 else
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30 export_sym_check=
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31 fi
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32 ;;
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33 *)
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34 if test x$build = x$host; then
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35 export_sym_check="objdump${exeext} -T"
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36 elif test x$host = x$target; then
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37 export_sym_check="$gcc_cv_objdump -T"
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38 else
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39 export_sym_check=
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40 fi
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41 ;;
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42 esac
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43
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44 if test x"$enable_plugin" = x"yes"; then
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45
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46 AC_MSG_CHECKING([for exported symbols])
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47 if test "x$export_sym_check" != x; then
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48 echo "int main() {return 0;} int foobar() {return 0;}" > conftest.c
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49 ${CC} ${CFLAGS} ${LDFLAGS} conftest.c -o conftest$ac_exeext > /dev/null 2>&1
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50 if $export_sym_check conftest$ac_exeext | grep -q foobar > /dev/null; then
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51 : # No need to use a flag
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52 AC_MSG_RESULT([yes])
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53 else
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54 AC_MSG_RESULT([yes])
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55 AC_MSG_CHECKING([for -rdynamic])
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56 ${CC} ${CFLAGS} ${LDFLAGS} -rdynamic conftest.c -o conftest$ac_exeext > /dev/null 2>&1
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57 if $export_sym_check conftest$ac_exeext | grep -q foobar > /dev/null; then
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58 plugin_rdynamic=yes
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59 pluginlibs="-rdynamic"
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60 else
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61 plugin_rdynamic=no
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62 enable_plugin=no
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63 fi
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64 AC_MSG_RESULT([$plugin_rdynamic])
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65 fi
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66 else
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67 AC_MSG_RESULT([unable to check])
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68 fi
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69
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70 # Check -ldl
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71 saved_LIBS="$LIBS"
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72 AC_SEARCH_LIBS([dlopen], [dl])
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73 if test x"$ac_cv_search_dlopen" = x"-ldl"; then
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74 pluginlibs="$pluginlibs -ldl"
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75 fi
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76 LIBS="$saved_LIBS"
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77
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78 # Check that we can build shared objects with -fPIC -shared
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79 saved_LDFLAGS="$LDFLAGS"
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80 saved_CFLAGS="$CFLAGS"
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81 case "${host}" in
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82 *-*-darwin*)
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83 CFLAGS=`echo $CFLAGS | sed s/-mdynamic-no-pic//g`
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84 CFLAGS="$CFLAGS -fPIC"
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85 LDFLAGS="$LDFLAGS -shared -undefined dynamic_lookup"
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86 ;;
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87 *)
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88 CFLAGS="$CFLAGS -fPIC"
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89 LDFLAGS="$LDFLAGS -fPIC -shared"
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90 ;;
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91 esac
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92 AC_MSG_CHECKING([for -fPIC -shared])
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93 AC_TRY_LINK(
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94 [extern int X;],[return X == 0;],
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95 [AC_MSG_RESULT([yes]); have_pic_shared=yes],
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96 [AC_MSG_RESULT([no]); have_pic_shared=no])
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97 if test x"$have_pic_shared" != x"yes" -o x"$ac_cv_search_dlopen" = x"no"; then
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98 pluginlibs=
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99 enable_plugin=no
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100 fi
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101 LDFLAGS="$saved_LDFLAGS"
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102 CFLAGS="$saved_CFLAGS"
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103
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104 # If plugin support had been requested but not available, fail.
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105 if test x"$enable_plugin" = x"no" ; then
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106 if test x"$default_plugin" != x"yes"; then
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107 AC_MSG_ERROR([
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108 Building GCC with plugin support requires a host that supports
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109 -fPIC, -shared, -ldl and -rdynamic.])
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110 fi
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111 fi
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112 fi
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113 ])
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